I have an old relative in her 70s who took some vaccination jabs 2 years ago. She has no idea what jab it was due to her aging mind. I intend to bring her to take pneumococcal vaccine to protect against pneumonia but I do not know if she took the same vaccine 2 years ago.
Is it dangerous for an old lady to take pneumococcal vaccine twice within 2 years? Any over-dosage hazard to be mindful of?